testing/xmrig-proxy: upgrade to 6.14.0

Ref https://github.com/xmrig/xmrig-proxy/releases/tag/v6.14.0
8 jobs for !22962 with xmrig-proxy in 2 minutes and 11 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #432206
docker-alpine x86_64
lint

00:00:17

 
  Build
passed #432211
docker-alpine ci-build aarch64
build-aarch64

00:01:05

passed #432213
docker-alpine ci-build armhf
build-armhf

00:00:56

passed #432212
docker-alpine ci-build armv7
build-armv7

00:00:55

passed #432210
docker-alpine ci-build ppc64le
build-ppc64le

00:01:02

passed #432209
docker-alpine ci-build s390x
build-s390x

00:01:00

passed #432208
docker-alpine ci-build x86
build-x86

00:00:27

passed #432207
docker-alpine ci-build x86_64
build-x86_64

00:00:26